1. HW #1
Due:
Ch. 1: P11, P12, P13, P14, PM2
Ch.2: P7, P12

2. Fundamental Properties of Light
This Lecture:
Chapter 1 (review +)
Fundamental Properties of Light
Reading Assignment: All Chapter 1
Chapter 2
Geometric Optics
Reading Assignment: All Chapter 2

3. Properties of Light How does it travel? How fast does it travel?
What is it that travels?
Is it wave, particle, or just rays?

4. Light travels in a straight line

5. Light travels in a straight line
The intensity varies with the square of the distance

6. (example: comets tail is always facing away from the sun)
Light has momentum
(example: comets tail is always facing away from the sun)

7. Reflection

8. Refraction

9. Diffraction
silver lining

10. Light is Wave What is a wave?! distance Harmonic wave:
wavelength
Frequency
(Hertz)
Velocity (300,000,000 meters/sec)
Wavelength (meters)

11. amplitude z
frequency or
wavelength z
phase z

12. Wavefront

13. Light has color!!
Color of the light depends on its wavelength …..

14. *Ripple Tank Waves
* Longitudinal and Transverse Waves -2
*Waves, ElectroMagnetic
*Oscillating Charge Field

15. Electromagnetic Spectrum

16. Visible Light Spectrum

17. Resonance Spring Strings (musical instruments) Antenna
Radio or TV Tuner
Microwave Ovens
Atoms and Light
Oscillations have natural frequency (= resonance frequency)

18. Light sources (thermal)
*Color Temperature (Vase)
*Black Body

19. Fluorescent Lamp Light Spectrum of various sources
*Phosphorescence: E&M Radiation (Joblonski Diagram)

20. Laser (Ruby) End of Chapter 1 *E&M Radiation (Absorption and Emission)
* Ruby Laser
End of Chapter 1

21. Geometrical Optics (Chapter 2)
When objects are much larger than the wavelength
Light Rays (Ray Optics)

22. Shadows *Shadow-point source *Shadow: Extended Source
*Shadow: Extended Source

23. Solar Eclipse: Aug
Earth
Moon
SUN

25. The Lunar Eclipse

26. Pinhole Camera *Pinhole Camera

28. Depth of Image and more

29. The effect of pinhole size

30. Diffraction

31. Reflection *Oscillating Charge Field

32. Law of Reflection
Normal

34. Mirrors
Silvered (first surface, second surface)
Half silvered

35. Reflectivity (how much is reflected?)
Grazing Incidence Reflection (glass windows, water surfaces, waxed floors, etc.)

36. Sun Pillars and Sub Suns

37. Ice Crystals

38. Sub Sun
A bright subsun looking downwards from 11,000m over Italy, late afternoon 18th July The halo was intermittently visible over the southern and central parts of the country covered by a thin cirrus sheet. The halo elongated and contracted as the tilts of the plate crystal mirrors changed. Reflections from lakes and rivers shine through the cloud. Video by Les Cowley.

39. Sub Sun

41. Sun Pillar

42. Multiple Reflections Example: Second Surface Mirrors